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Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (6): 1019-1022.

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Liquidus Temperatures of System Na3AlF6-K3AlF6-AlF3 for Aluminum Electrolysis at Lower Temperature

WEI Chen-juan, LAI Yan-qing, LI Jie*, TIAN Zhong-liang, WANG Jia-wei, ZOU Zhong and LIU Ye-xiang   

  1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2011-02-23 Revised:2011-04-10 Online:2011-11-25 Published:2011-11-07
  • Contact: LI Jie E-mail:csulightmetals02@163.com
  • Supported by:

    Supported by the National Basic Research Program of China(No.2005CB623703) and the National High-Tech Research and Development Program of China(No.2008AA030503).

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Abstract: Liquidus temperatures in the molten salt system Na3AlF6-K3AlF6-AlF3 of interest for aluminum electrolysis were determined by thermal analysis method. The results were presented and an empirical equation describing  liquidus temperatures for primary crystallization was derived t=1003.5–0.081×A2.3159–5.87×B0.657–0.024×A2.22×B1.14+ 0.035×A2.17×B1.084, where t is the liquidus temperature in degree Celsius, A denotes the mass fraction of AlF3 in system Na3AlF6-K3AlF6- AlF3, and B denotes K3AlF6/(Na3AlF6+K3AlF6 ) in mass(%, the value was defined as KR in this paper). The composition limitations are 0<w(AlF3)<30%, and 0<KR<50%. The isothermal diagram of molten salt system Na3AlF6-K3AlF6-AlF3 was obtained in this composition limitation.

Key words: Liquidus temperature, Na3AlF6-K3AlF6-AlF3 system, Empirical equation